3-Acre Lots in Unincorporated Monarch Estates - Old Monroe. Build your dream home on a spacious 3-acre lot in desirable Monarch Estates! Located in unincorporated Old Monroe, these lots offer public water and electric at the property line and the flexibility to bring your own builder. Current gravel road will have first layer of asphalt layed by end of October with the final layer completed once all lots are sold. Don't miss your chance for peaceful country living with modern conveniences!